Modify Headers
Add, modify and filter http request headers. You can modify the user agent string, add headers to spoof a mobile request (e.g. x-up-calling-line-id) and much more. Take a look at the help tab of the Modify Headers window.Some people think that 'user-agent' is a custom way of specifying the user agent string. This is not true, for a guide on this and other HTTP request headers, look at this W3C page: http://www.w3.org/Protocols/HTTP/HTRQ_Headers.htmlPlease DO NOT post support requests or issues here. To make suggestions or report issues, please go to http://modifyheaders.mozdev.org/
Supported
versions: Firefox 1.0 - 2.0.0.* ALL Mozilla 1.7 - 1.8 ALL SeaMonkey 1.0 - 1.0.* ALL
Notes / Comments: This defect has been fixed: The Add, Modify, Filter menulist would not change to the correct value when the Edit button is clicked.
Categories: Developer Tools, Miscellaneous

Modify Headers main window:

Modify Headers main window:
